Isn't tagging them also a way of warning them? I mean those tags can be removed or changed to neutral anytime the issue with that account is resolved. In this case, withdrawing from the signature campaign.
Just too much work for the DT member to tag them and then change them to neutral or removed for hundreds of participants.SO just give warning and let them decide their own fate after that permanently.
You don't tag when you warned, red tagging is different by definition " You think that trading with this person is high-risk", don't deviate from the real meaning. Maybe tagging as neutral would be appropriate based on its meaning "Other comments.".
If we can use the tagging system properly, there would be no complains, DT's misusing the trust system leads to misleading forum members as that trust is visible.
When someone supporting scam activities with their knowledge then it can also be considered under your definition.You can ask the same question to red trust queen and what answer you will get.